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Transmission Fluid Change

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Old Oct 1, 2025 | 10:04 PM
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2019 W222 S560 4Matic/2025 Yukon Denali
Transmission Fluid Change

Hi All,
Long time.
I just did my trans again at 102K (Last time was at 47K) and Here is what I did.
Last time I measured 10l come out.
So I put back in 10l.
I didn't wait for it to warm up to 102 dg, or anything like that.
Car shifts fine.
I did this again, I took out 10l of fluid (TQ had about 4l) and I put back in 10l, didn't wait for fluid to reach 102 and start the car, etc.
I just put a new pan on and drove.
And she's driving just fine.....
Am I right or am I right?
What do you all think of this 'no fuss' method?
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Old Oct 2, 2025 | 03:11 AM
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W212 FL
There should be no harm doing that as long as you use the proper correct type of things recommended by the manufacturer .
It's like an oil change, some waits for 1 year while others can change it every 6 months
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Old Oct 2, 2025 | 09:16 PM
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Your method works to get the car driving, but you're likely overfilling it. The old fluid that stays in the torque converter expands a lot when it gets hot. By putting in the full 10 liters cold, you're adding too much. It might be fine now, but long-term, overfilling can damage seals and cause transmission problems. The warming procedure is to get the level exact.
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Old Oct 4, 2025 | 11:28 AM
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222 S-65
OP how are you draining the torque converter?

I’ve looked for a drain plug in my torque converter and don’t find one.
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Old Oct 4, 2025 | 03:49 PM
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W204 2010 C300 4matic Sport M272
It is there.

Bell housing should have two rubber plugs, round one right on the bottom and a square one a little off to the passenger side.

Turn the crankshaft pully to find the drain plug.


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Old Oct 4, 2025 | 08:49 PM
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what he said above.
pull the rubber plug off, in front of the trans, use a screwdriver w a cloth on it and spin the TQ, it will appear.
t27 will get it out.
about 4-5l comes out from there
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Old Oct 8, 2025 | 09:11 PM
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I also want to add that you should get an extra rubber plug for the TQ inspection port, I lost mine in the TQ.
I went back and did the 'proper' fill and level procedure.
Looks like it's about 9.8l that it starts to stop flowing and goes to a drizzle on position 3.

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